I have a yard (30,000 sq ft) that homeowners never planted for two years. Now it has become a jungle that they just mow. They want removal, grading and seed/sod ready. Ground is black farm ground, no rocks. My method has been to till the first couple inches, scrape it up with tractor/skid buckets, till again and then grade with box/roller combo. Hand rake edges/corners. Layout of yard is not conducive to discing. Other methodologies/system that works better?